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[Vol. 87 
midline. The basic color was amber brown, but it was overlaid with 
irregular patches of first white and then more brown silk. Where 
white overlaid brown the color was white, but where brown overlaid 
white an intermediate light brown color was produced. The total 
result was that the sacs appeared to be covered with irregularly 
shaped and distributed patches of brown, light brown, and white. As 
with other Mastophora species (Gertsch 1955) strong lines (with a 
faint golden tinge) accumulated around groups of egg sacs. 
Fig. 16. Egg sac construction. A. Spider spins a loose mat of silk hanging at the end 
of a reinforced line. B. Mass of eggs begins to emerge. C. Mass has emerged further and 
is cradled by the mat of silk. D. Spider “treadmills” on sac which has now assumed a 
smooth outline. E. Finished sac. 
